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Furies are weak and only effective against slow-moving units. There's no need to even mention regular harpies. Orcs have much more formidable units like Crushers, especially Demolishers. This unit, in skilled hands, can break through almost any unit, even elite ones. The only difficulties might arise against archers and slightly against flying units. All ground units can be easily controlled with goblin traps, preventing neutral units from focusing on anyone. Demolishers, in turn, simply destroy enemy stacks one by one.
At the start, you get one stack of Crushers (which are upgraded as quickly as possible) and the rest are single goblin units + the main goblin stack. Then, you add Snatchers, which increase the mobility of the attack stack, or reduce the mobility of neutral units, allowing you to control them even more effectively.
At the start, you get one stack of Crushers (which are upgraded as quickly as possible) and the rest are single goblin units + the main goblin stack. Then, you add Snatchers, which increase the mobility of the attack stack, or reduce the mobility of neutral units, allowing you to control them even more effectively.